Attribute Macro claw_tool 

#[claw_tool]

Attribute macro for defining MCP tools

This macro transforms an async function into an MCP tool definition with auto-generated JSON Schema for input parameters.

Arguments

• name - Optional tool name (defaults to function name)
• description - Optional tool description (defaults to doc comment)

Requirements

• Function must be async
• Return type must be ToolResult or Result<ToolResult, E>
• Parameters must be JSON-serializable types

Supported Parameter Types

• String - JSON string
• i32, i64, u32, u64, f32, f64 - JSON number
• bool - JSON boolean
• Option<T> - Optional parameter (not required in schema)
• Vec<T> - JSON array

Example

use rusty_claw::prelude::*;
use rusty_claw::mcp_server::ToolResult;

#[claw_tool(name = "echo", description = "Echo a message")]
async fn echo_tool(message: String) -> ToolResult {
    ToolResult::text(message)
}

// Use the generated tool
let tool = echo_tool();
assert_eq!(tool.name, "echo");